Ancient skulls hole drilling ritual

Remember those ancient skulls with holes in them? (ancient skulls with holes)
Science says this is done for migraine relief, or in case of brainjury and perhaps surgery.
But in  reality they don't know why exactly it is done.

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What if this was done to insert a brainimplant, or feed wires into the skull.
Perhaps when alive this skull was wearing a hightech helmet, directly connected to the brain.
Like a sort of bio robot/half android, working for a high advanced civilisation that once existed .